TLIN1431-Q1: why external LDO is used in channel expansion examples

Iris Shen

Part Number: TLIN1431-Q1

Hi team,

We found in all the channel expansion examples, 3.3V external LDO is used. We want to know why. Why 3.3 LDO output of TLIN1431 isn't used to supply MCU VDD?

over 2 years ago

0 Eric Hackett over 2 years ago

TI__Guru 74252 points

Iris,

This is just showing that there are options for the integrated LDO output besides supplying the MCU. There is no particular reason otherwise.

Regards,

Eric Hackett

0 Iris Shen over 2 years ago in reply to Eric Hackett

TI__Expert 4002 points

Hi Eric,

Do you mean this LDO is the integrated LDO of 1431? We thought this is an external discrete LDO.

And add another questions:
What does the 'autosar' in below chart mean? I thought Autosar is done at MCU side and I don't understand the relationship with CAN/LIN.

+1 Eric Hackett over 2 years ago in reply to Iris Shen

TI__Guru 74252 points

Iris,

It is an external LDO, and there is an integrated LDO. I was just stating that the block diagram is showing that the integrated LDO can be used to supply something else and an external LDO can be used.

AutoSAR is an Automotive software abstraction layer developed by third parties. AutoSAR is an industry standard and it is indeed a part of the MCU side of development, but would be specific to the transceiver/SBC being used.

Regards,

Eric Hackett

0 Iris Shen over 2 years ago in reply to Eric Hackett

TI__Expert 4002 points

Hi Eric,

What is the relationship between autosar and transceiver? Does the abstraction define the specific transceiver should be chosen?

0 Eric Hackett over 2 years ago in reply to Iris Shen

TI__Guru 74252 points

Iris,

AutoSAR is written for a specific device, yes. It is written to enable configuration and control of the transceiver through the Automotive standard software.

Regards,

Eric Hackett

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TLIN1431-Q1: why external LDO is used in channel expansion examples